Vivarium



FIG. 1 is a front top perspective view of a vivarium showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a rear perspective view thereof;

FIG. 4 is a left side perspective view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side perspective view thereof; and,

FIG. 7 is a top view thereof.

The broken lines in the drawings illustrate portions of the vivarium that form no part of the claimed design. 

CLAIM The ornamental design for a vivarium, as shown and described. 